import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;

public class Main {

    // 三角形
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {

            BigInteger a = in.nextBigInteger();
            BigInteger b = in.nextBigInteger();
            BigInteger c = in.nextBigInteger();
            boolean k = true;
            if ((a.add(b)).compareTo(c) <= 0) {
                k = false;
            }
            if ((b.add(c)).compareTo(a) <= 0) {
                k = false;
            }
            if ((a.add(c)).compareTo(b) <= 0) {
                k = false;
            }
            if (k) {
                System.out.println("Yes");
            } else {
                System.out.println("No");
            }
        }
    }

    // 不用加减乘除做加法
    public int Add(int num1, int num2) {
        return Math.addExact(num1, num2);
    }


    public int jumpFloorII(int number) {
        // write code here
        return (int) Math.pow(2, number - 1);
    }

    // 快到碗里来
    public static void main1(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) {
            double l = in.nextDouble();
            double r = in.nextDouble();

            if (r * 2 * 3.14 > l) {
                System.out.println("Yes");
            } else {
                System.out.println("No");
            }
        }
    }
}